Discussion
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. GT, IV, MZ, SF,?
Answer: A
The next cluster is AN.
In the first letters G, I, M, S the jumps are +2, +4 and +6, so the next jump is +8: S is the 19th letter and 19 + 8 = 27, which wraps round to A. In the second letters T, V, Z, F the jumps are again +2, +4 and +6, so the next jump is +8: F is the 6th letter and 6 + 8 = 14, which is N.
YL, AL and YN each get one of the two letters wrong, so only AN follows both patterns.
A quick check is to write the letters of the two series side by side: G-T, I-V, M-Z, S-F. Each pair moves by the same amount in both letters at every step, so the same +8 jump applies to both letters of the answer. Wrapping past Z to A is needed in both positions, which is why the answer starts with A.
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